[SI-LIST] Re: 90 degree turn in PCB tracks

Light will become the dominant force but there are still lots of HF
applications that have to be considered in a mostly light circuit such
as how does one power an led or laser to switch on and off at 10GHz?
With light? We first need to create light. How do we clock a chip? How
do we send light data across the internet and address the billions of ip
addresses worldwide? Everyone gets a wavelength?!??!?1=20
Sorry for off topic but I wanted to reassure SI people that there will
always be high speed issues or maybe we will have solved them all by
then?!

Mark

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Grasso, Charles
Sent: 25 July 2006 18:10
To: leeritchey@xxxxxxxxxxxxx; Vishnu Mohan; lijun_hit@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: 90 degree turn in PCB tracks

In the year 21oo I predict signal transmission=3D20
using light. SI (at least using copper) will fade into the distance!!

Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx;
Email Alternate: chasgrasso@xxxxxxxx


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Lee Ritchey
Sent: Tuesday, July 25, 2006 9:47 AM
To: Vishnu Mohan; lijun_hit@xxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: 90 degree turn in PCB tracks

I wonder who started the rumor that right angle bends create acid traps.

It is not true and has never been true.  Fables die hard, both the right
angle bend causing signal integrity problems and acid traps.

Bet we don't get these flushed out of our profession before 2100 and
maybe
not even then!


> [Original Message]
> From: Vishnu Mohan <vishyin8@xxxxxxxxx>
> To: <lijun_hit@xxxxxxxxx>
> Cc: <si-list@xxxxxxxxxxxxx>
> Date: 7/25/2006 12:55:11 AM
> Subject: [SI-LIST] Re: 90 degree turn in PCB tracks
>
> Dear Dhaval,
> To my kowledge 90 degree bends are not recomended because of the acid
trap.
> Some people says 90 degree bend can cause more reflection than 45
degree,
> but it is not true. At high frequency 90 degrees produce less
reflection
> than 45 degree.
>
> Please find the attached document.
>
> With Regards
> Vishnu Mohan
>
> On 7/25/06, jun li <lijun_hit@xxxxxxxxx> wrote:
> >
> > I read a little about this topic. To 90 degree bend, there will be
overlap
> > area. It behaves as capacitive discontinuity. Moreover, the sharp
point
at
> > the corner will enlarge electrical field.
> >
> >   regards
> >
> >
> > Dhaval Bhodia <bhodia1@xxxxxxxxx> wrote:
> >   Dear Experts
> > I want to know that why PCB tracks can not have
> > 90 degree bend ? second why 45 degree bend is most
> > preferable ? anybody has made any analysis on bending
> > of PCB tracks ? what are the technical issues will
> > come if some one makes 90 degree bend in PCB ? What
> > are electrone and transmission line charasterisic
> > stops to make that 90 degree turn in PCB tracks ?
> > Regards
> > Dhaval
> > __________________________________________________
> >
> >
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